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Contact Pressure, sliding distance and wear rate analysis at trunnion of hip implant for daily Activities: A finite element approach

Soliman Md Mohiuddin, Islam Mohammad Tariqul, Kirawanich Phumin, Chowdhury Muhammad E.H., Alam Touhidul, Alrashdi Ayed M., Misran Norbahiah, Soliman Mohamed S.

Biocybernetics and Biomedical Engineering

2025

Vol. 45, iss. 2

137--153

This research analyses contact pressure, sliding distance, and wear rate at the trunnion interface of hip implants during various activities to understand post-hip replacement outcomes. The study uses a numerical model and ISO-7206–6:2013 constraints with an AML hip implant. Greater Fx, Fy, and Fz forces broaden contact pressure distribution. The highest pressure occurs on the proximal superolateral surface, with the lowest on the anterior and posterior surfaces. The HIGH100 (individuals weighing above 100 kg) weight category demonstrates 2 times higher maximum and average contact pressure compared to AVG75 (individuals weighing 75 kg) for sit-down and knee bend activities. Force components and the duration of a full gait cycle influence sliding distance. Stance activities show the highest sliding distance due to rapid changes in force load during the gait cycle. For sit-down and knee bend activities, the total sliding distance is 2.5 times higher in the HIGH100 weight category compared to AVG75. Sliding distance primarily occurs at the proximal superolateral-inferomedial-anterior-posterior contact surface, decreasing distally. Based on contact pressure, sliding distance, and wear volume rate, jogging and stance activities pose the highest risk for hip replacement patients, while cycling is the safest. The HIGH100 weight group exhibits 5- and 4-times greater wear volume rates than AVG75 in sit-down and knee bend activities, respectively. The research findings align with wear degradation observed in retrieved hip implants, validating the study. These insights can assist patients in making informed decisions about performing activities after surgery while enabling physicians to provide accurate guidelines.

Zastosowanie inżynierii odwrotnej w modelowaniu protez stawów

Sikorski S., Duda P., Dulęba K., Wróbel Z.

Mechanik

2016

R. 89, nr 12

1912--1913

Przedstawiona praca jest przykładem wykorzystania nowoczesnych urządzeń typu skanery 3D oraz drukarki 3D w procesie modelowania protez stawów. Stosowanie metod przyrostowych pozwala na tworzenie wyrobów wykonanych z różnych materiałów w zależności od użytej technologii druku 3D. Pozwala to wykonywać przedmioty pod konkretne zastosowania bądź osoby. W artykule autorzy przedstawili wykorzystanie technologii inżynierii odwrotnej do zamodelowania endoprotezy stawu biodrowego, która będzie wykonana dla konkretnego pacjenta.

This paper is an example of using reverse engineering to modeling hip implant. In this article the authors present used of 3D scanners and 3D printer in medical applications. Reverse engineering allow to created hip implant which are match to specific patient.

In vitro history to evaluate the effects of daily activities on cemented hip implants

Cristofolini L., Savigni P., Teutonico A. S., Viceconti M.

Acta of Bioengineering and Biomechanics

2003

Vol. 5, no. 2

77-87

The loads acting on the hip joint during daily activities contribute to the failure of the fixation of cemented hip stems. An in vitro analysis of newly designed prostheses is necessary prior to in vivo clinical trials. In vitro pre-clinical testing procedures up to now have consisted in simulating only one or two conditions. The goal of this work was to define a procedure to assess the long-term effect of the most stressing activities on the integrity of the cement mantle. Thus, a cyclic load of constant amplitude is not acceptable. All activities inducing high loads need to be included, so as to replicate the most critical scenario from a fatigue point of view. The following activities were included in the load history: stair climbing and descending, car entry and exit, bathtub entry and exit, and stumbling. Load values and direction were assigned to each activity, based on the literature. A typical week was defined for a patient, based on statistics from the literature. An in vitro simulation running for 2 weeks was able to replicate the load peaks occurring in 24 years of patient activity. Stem-cement elastic micromotion and permanent migration arc continuously recorded at 5 locations. The cement mantle is inspected by means of dye penetrants after test completion to quantify the fatigue damage in the cement mantle. The load history was successfully applied to two different designs and is therefore ready for future applications to evaluate the long-term performance of the new prostheses and the effects of daily activities on implant outcomes.